Android多媒体功能开发-使用AudioRecord类录制音频的例子

package com.zzk.a1507audiorecord; import androidx.appcompat.app.AppCompatActivity; import androidx.core.app.ActivityCompat; import android.Manifest; import android.content.pm.PackageManager; import android.media.AudioFormat; import android.media.AudioManager; import android.media.AudioRecord; import android.media.AudioTrack; import android.media.MediaRecorder; import android.os.Bundle; import android.view.MotionEvent; import android.view.View; import android.widget.*; import java.io.*; public class MainActivity extends AppCompatActivity { File soundFile; // 存放录音的文件 boolean isRecording; int frequency = 11025; int inChannelConfig = AudioFormat.CHANNEL_IN_MONO; int outChannelConfig = AudioFormat.CHANNEL_OUT_MONO; int audioFormat = AudioFormat.ENCODING_PCM_16BIT; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); LinearLayout ll = new LinearLayout(this); ll.setOrientation(LinearLayout.VERTICAL); setContentView(ll); // 录制到文件：Android/data/<package-name>/files/audioRecord.pcm soundFile = new File(getExternalFilesDir(null), "audioRecord.pcm"); Button btnRecord = new Button(this); btnRecord.setText("Record"); ll.addView(btnRecord); btnRecord.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View arg0) { Thread t = new Thread() { public void run() { try { record(); } catch (IOException e) { e.printStackTrace(); } } }; t.start(); } }); Button btnStop = new Button(this); btnStop.setText("Stop"); ll.addView(btnStop); btnStop.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View arg0) { isRecording = false; } }); Button btnPlay = new Button(this); btnPlay.setText("Play"); ll.addView(btnPlay); btnPlay.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View arg0) { if (soundFile.exists()) { try { play(frequency); } catch (IOException e) { e.printStackTrace(); } } } }); Button btnPlayFast = new Button(this); btnPlayFast.setText("Play Fast"); ll.addView(btnPlayFast); btnPlayFast.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View arg0) { if (soundFile.exists()) { try { play(frequency * 4 / 3); } catch (IOException e) { e.printStackTrace(); } } } }); Button btnPlaySlow = new Button(this); btnPlaySlow.setText("Play Slow"); ll.addView(btnPlaySlow); btnPlaySlow.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View arg0) { if (soundFile.exists()) { try { play(frequency * 3 / 4); } catch (IOException e) { e.printStackTrace(); } } } }); Button btnSpeak = new Button(this); btnSpeak.setText("Press to Speak"); ll.addView(btnSpeak); btnSpeak.setOnTouchListener(new View.OnTouchListener() { @Override public boolean onTouch(View arg0, MotionEvent arg1) { switch (arg1.getAction()) { case MotionEvent.ACTION_DOWN: Thread t = new Thread() { public void run() { try { record(); } catch (IOException e) { e.printStackTrace(); } } }; t.start(); break; case MotionEvent.ACTION_UP: isRecording = false; break; } return false; } }); } void record() throws IOException { // 动态权限申请 if (ActivityCompat.checkSelfPermission(this, Manifest.permission.RECORD_AUDIO) != PackageManager.PERMISSION_GRANTED) { ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.RECORD_AUDIO}, 1); return; } if (soundFile.exists()) soundFile.delete(); soundFile.createNewFile(); FileOutputStream fos = new FileOutputStream(soundFile); BufferedOutputStream bos = new BufferedOutputStream(fos); DataOutputStream dos = new DataOutputStream(bos); int bufferSize = AudioRecord.getMinBufferSize(frequency, inChannelConfig, audioFormat); short[] buffer = new short[bufferSize]; AudioRecord audioRecord = new AudioRecord(MediaRecorder.AudioSource.MIC, frequency, inChannelConfig, audioFormat, bufferSize); audioRecord.startRecording(); isRecording = true; while(isRecording){ int bufferRead = audioRecord.read(buffer, 0, bufferSize); for(int i=0; i<bufferRead; i++){ dos.writeShort(buffer[i]); } } audioRecord.stop(); audioRecord.release(); dos.close(); bos.close(); fos.close(); } void play(int frq) throws IOException{ int length = (int)soundFile.length()/2; if(!soundFile.exists() || length==0) { Toast.makeText(getBaseContext(), "音频文件不存在或为空", Toast.LENGTH_SHORT).show(); return; } short[] data = new short[length]; FileInputStream fis = new FileInputStream(soundFile); BufferedInputStream bis = new BufferedInputStream(fis); DataInputStream dis = new DataInputStream(bis); int i=0; while(dis.available()>0) { data[i] = dis.readShort(); i++; } dis.close(); bis.close(); fis.close(); AudioTrack audioTrack = new AudioTrack(AudioManager.STREAM_MUSIC, frq, outChannelConfig, audioFormat, length*2, AudioTrack.MODE_STREAM); audioTrack.play(); audioTrack.write(data, 0, length); audioTrack.stop(); //audioTrack.release(); // 不能马上release，因为write后是异步播放，此时还刚开始播放，release就不播放了 } }